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Why AgBr shows both frenkel and schotky defect?
When the both the cations and anions are absent from the crystal lattice it is called Schottky defect. This defect is shown when the anions and cations have comparable size. The Frenkel defect is shown by ionic molecules when their is a large difference in the size of anions and cations. The smaller anions are very much mobile and they occupy interstitial site. AgBr has cations and anions with comparable size and hence it shows Schottky defect but the Ag+ ion is very much mobile and it easily occupies interstitial place getting dislocated from its original place, that's why the ionic crystal AgBr shows both Schottky and Frenkel defects.
Name one compound containing large anions which can be used for precipitation of potassium ions from aqueous solution?
Sodium tetraphenylborate (NaB(C6H5)4) is a compound containing large anions that can be used to precipitate potassium ions from aqueous solution. When added to a solution containing potassium ions, insoluble potassium tetraphenylborate precipitates out.
How is an ionic bond held together?
It is held together by electrostatic attraction between the ions in the compound. In the bond, there is a complete transfer of electrons between the atoms, so this makes the cation lose electrons and the anion gain electrons. The cation becomes positive and the anion becomes negative, and therefore there is a large attraction between the atoms.
What is Fajan's rule?
Fajans' Rules, formulated by Kazimierz Fajans in 1923, are used to predict whether a chemical bond will be covalentor ionic, and depend on the charge on the cation and the relative sizes of the cation and anion.IonicCovalentLow positive chargeHigh positive chargeLarge cationSmall cationSmall anionLarge anionThus sodium chloride (with a low positive charge (+1), a fairly large cation (~1 Å) and relatively small anion (2Å) is ionic; but aluminum iodide (AlI3) (with a high positive charge (+3) and a large anion) is covalent.
Is anion an example of anabolism?
In a dehydration, which is also called a condensation reaction, water molecules are being removed and new bonds are forming(peptide linkages, glycosydic linkages and ester linkages), therefore it is an anabolic reaction.
Why AgBr shows both frenkel and schotky defect?
When the both the cations and anions are absent from the crystal lattice it is called Schottky defect. This defect is shown when the anions and cations have comparable size. The Frenkel defect is shown by ionic molecules when their is a large difference in the size of anions and cations. The smaller anions are very much mobile and they occupy interstitial site. AgBr has cations and anions with comparable size and hence it shows Schottky defect but the Ag+ ion is very much mobile and it easily occupies interstitial place getting dislocated from its original place, that's why the ionic crystal AgBr shows both Schottky and Frenkel defects.
What would happen to a resting membrane potential if the concentration of a large intracellular anions that are unable to cross the membrane experimentally is increased?
If the concentration of large intracellular anions..i.e. proteins, which are unable to cross the membrane due to their large size.. were to increase, the resting potential would reach a more negative state, a deviation from -70mV to a more negative value do to these anions.
Why is cell membrane impermeable to organic anions?
The cell membrane is impermeable to most ions. An ion channel is needed for cations and anions to cross the membrane, thus they can't freely pass the plasma membrane. Axons of neurons lack specific permeability for anions - which might explain why your asking this question and why you think cells lack anionic permeability (which they don't). Ion channels in the axon have pores with high concentrations of negatively charged amino acids on the cellular and extracellular sides of the channel. This causes a repulsion of anion's while attracting cations, however being simple diffusion it's important not to suggest that the cations are being sucked out like a vacuum, the concentration gradient plays a predominant when dictating which ions and how fast they will be diffusion into our out of the cell.
Why are large cations precipitated by large anions from aqueous solutions?
Large cations can be precipitated by large anions from aqueous solutions due to the formation of insoluble compounds with low solubility product constants. The large size of the ions can cause them to form a stable lattice structure with the opposite charged ions, resulting in a precipitate that falls out of solution. This process is known as precipitation or forming an insoluble salt.
Name one compound containing large anions which can be used for precipitation of potassium ions from aqueous solution?
Sodium tetraphenylborate (NaB(C6H5)4) is a compound containing large anions that can be used to precipitate potassium ions from aqueous solution. When added to a solution containing potassium ions, insoluble potassium tetraphenylborate precipitates out.
Are cations or anions soluble in water?
In general, cations are soluble in water because they form positive ions that can attract the negatively charged oxygen atoms in water molecules. Anions can also be soluble in water depending on their size and charge, but some large and highly charged anions are less soluble due to stronger electrostatic interactions with water molecules.
Why does lithium form stable complex compound than other alkali metals?
As complex comopunds or salts are those which can dissociate to give complex anion and simple cation and vice versa. As Li is small in size and if Li combine with comples anion then it will form a complex compounds.While the other alkali metals are large in size. So if these metals combine with large anion or complex anion then they does not form a complex compounds. It is the reason that Cation which is in the form of alkali is large or complex and anion also comple. So, in this case both ions that produced are large.That's why other then Li, alkali metals not form comples compounds. One of the best example of Li complex compound is " Lithium tetra-amine " Li(NH3)4
What is the element group called carbonate?
"Carbonate" is not an element or an element group; instead, it is a polyatomic anion and is one of a large group of oxyanions.
How is an ionic bond held together?
It is held together by electrostatic attraction between the ions in the compound. In the bond, there is a complete transfer of electrons between the atoms, so this makes the cation lose electrons and the anion gain electrons. The cation becomes positive and the anion becomes negative, and therefore there is a large attraction between the atoms.
Why polar bears are dangerous?
Because they are large, powerful predators, and are very capable of killing a human easily.
What are the advantages to pie charts?
summarize large amount of data in visual formis easily understoodData can be easily compared
Are large grains easily seen as fine grained?
Large grains are easier to see than fine grains.
